<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>location</title>
</head>
<body>
    <div id='baidu' onclick="history.go(-2)">回退</div>
</body>
<script>
    // console.log(window.location == document.location)
    // var bd = document.getElementById('baidu');

    // bd.onclick = function() {
    //     // location.assign('http://www.baidu.com')
    //     // location.replace('http://www.baidu.com')
    //     location.reload(true)
    // }
</script>
</html>